Separation of substances Worksheet-2

Separation of substances Worksheet-2

Multiple-Choice Question:

13. A small boy mischievously mixed small pebbles into a bag of pulses. What method will you employ to separate the mixture?

(A) Sieving           (B) Winnowing    (C) Handpicking  (D) Filtration

14. Bronze is an alloy of:

(A) Copper and zinc                         (B) Copper and tin

(C) Copper and iron                         (D) Copper and nickel

15. If the constituents of a solid-liquid mixture have different masses, then we can separate them using:

(A) sublimation                                (B) centrifugation

(C) winnowing                                 (D) evaporation

16. The method of separating mixtures using damp paper is called:

(A) Chromatography                       (B) Photography

(C) Metallurgy                                  (D) Spectrography

17. Separating the components of a homogeneous mixture using electricity is called:

(A) Electrification                            (B) Electrolysis

(C) Electrolyte                                  (D) Electromagnetisation

18. Solubility of a substance ______with _______ in temperature.

(A) Increase, decrease                     (B) Increase, increase

(C) Decrease, increase                     (D) Decrease, decrease

19. Match the following:

True/False:

20. Wood in pencil is considered a chemical mixture.
21. The process of washing of rice is decantation.
22. The quantity of a substance that can be dissolved in hot water is much more than in cold water.
23. Husk and wheat can be easily sepa­rated by winnowing.
24. The process of winnowing is used to remove small stone particles from wheat.

Answer key:

13.  (C)
14. (B)
15. (D)
16. (A)
17. (B)
18. (B)
19. 1-c, 2-e, 3-d, 4-a, 5-b, 6-f
20. True
21. True
22. True
23. True
24. False